LEDSchlucker
Member
- Joined
- Dec 20, 2018
- Messages
- 157
Hi guys,
a while ago I asked myself what the charge-discharge efficiency of a li-ion cell is. So I tried to measure it with an Opus, but the result that came out is pretty disappointing...
Measured Values:
Cell 1: Cell 2: Cell 3: Cell 4:
CH 2115mAh 2106mAh 2035mAh 2086mAh
DC 2378mAh 2105mAh 2097mAh 2130mAh
CH 2151mAh 2045mAh 2083mAh 2060mAh
DC 2394mAh 2071mAh 2054mAh 2087mAh
CH 2219mAh 2018mAh 2061mAh 2019mAh
DC 2451mAh 2125mAh 2117mAh 2134mAh
------------------------------------
Average per cell:
CH 2162mAh 2056mAh 2060mAh 2055mAh
DC 2408mAh 2100mAh 2089mAh 2117mAh
------------------------------------
------------------------------------
Total average:
CH 2083mAh
DC 2179mAh
"efficiency" (measured with Opus) = 2179mAh / 2083mAh = 1.046 which is 104.6% (which is impossible, because you can't take more electricity out than you put in)
As the result is over 100% (104.6%), the Opus has to be very imprecise! :s
Recently I read somewhere that the Opus is adding 30% to the discharged value because of the high impedance of the springs.
Is that correct, does the Opus add 30% to the measured capacity?
a while ago I asked myself what the charge-discharge efficiency of a li-ion cell is. So I tried to measure it with an Opus, but the result that came out is pretty disappointing...
Measured Values:
Cell 1: Cell 2: Cell 3: Cell 4:
CH 2115mAh 2106mAh 2035mAh 2086mAh
DC 2378mAh 2105mAh 2097mAh 2130mAh
CH 2151mAh 2045mAh 2083mAh 2060mAh
DC 2394mAh 2071mAh 2054mAh 2087mAh
CH 2219mAh 2018mAh 2061mAh 2019mAh
DC 2451mAh 2125mAh 2117mAh 2134mAh
------------------------------------
Average per cell:
CH 2162mAh 2056mAh 2060mAh 2055mAh
DC 2408mAh 2100mAh 2089mAh 2117mAh
------------------------------------
------------------------------------
Total average:
CH 2083mAh
DC 2179mAh
"efficiency" (measured with Opus) = 2179mAh / 2083mAh = 1.046 which is 104.6% (which is impossible, because you can't take more electricity out than you put in)
As the result is over 100% (104.6%), the Opus has to be very imprecise! :s
Recently I read somewhere that the Opus is adding 30% to the discharged value because of the high impedance of the springs.
Is that correct, does the Opus add 30% to the measured capacity?